The Nitrogen Cycle in Aquariums

When fish excrete their waste, what toxic byproduct is produced?

• nitrogen
• nitrites
• ammonia
• nitrates

What does toxic mean?

• poisonous
• murky
• dirty
• salubrious

After the ammonia is in the tank, which bacteria start to change it to something less toxic?

• nitrogen bacteria
• nitrosomas bacteria
• nitrobactor bacteria
• ammonia bacteria

Tags

NGSS.MS-LS2-3

Once the nitrosonomas bacteria decompose the toxic ammonia, the deadly ammonia is changed into the less toxic ___________.

• nitrite
• nitrate
• carbon dioxide
• oxygen

Tags

NGSS.MS-LS2-3

Now the less toxic nitrites are changed into something safer by the _____________ bacteria.

• nitrosomas
• ammonia
• nitrobactor
• toxic bacteria

Once the nitrobactor bacteria decompose the deadly nitrites, the nitrites are changed to the less toxic __________

• ammonia
• nitrites
• nitrates
• H2O

Tags

NGSS.MS-LS2-3

NGSS.MS-PS1-2

What is one way to lower the amount of nitrates in your tank?

• do a partial water change
• add more fish 
• remove fish
• lower the water temperature

Tags

NGSS.MS-LS2-4

As the aquarium gets "older" it gets __________ toxic.

• more
• less

Tags

NGSS.MS-LS2-4

What is another way to lower the nitrate level in your tank?

• add fish
• add snails
• add plants
• remove plants

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

This bacteria changes nitrites into nitrates

• nitrosomona bacteria
• nitrobacter bacteria
• penicillan 

Tags

NGSS.MS-LS2-3